Several of the chemical elements were known in prehistoric【C1】______ . One of the great【C2
【C1】
A.times
B.schedules
C.plans
D.timing
【C1】
A.times
B.schedules
C.plans
D.timing
The passage tells us that proof of life on Mars would______.
A.make clear the complex chemistry in the development of life
B.confirm the suggestion that bacterial fossils travelled to Earth on a meteorite
C.reveal the kind of conditions under which life originates
D.provide an explanation why life is common in the universe
According to Professor Morgan, what enables animals to freeze themselves?
A.A certain chemical in their bodies.
B.The change of certain circumstances around them.
C.A certain temperature.
D.A certain season in the year.
What is the main idea of the passage?
A.Reactions to the electric stress lead to more chemical yields.
B.Yields of commercially useful biologicals are increased.
C.Using electricity to elicit chemical production is very exciting.
D.Using electricity has a negative effect on plant growth.
The passage tells us that proof of life on Mars would______.
A.make clear the complex chemistry in the development of life
B.confirm the suggestion that bacterial fossils traveled to Earth on a meteorite
C.reveal the kind of conditions under which life originates
D.provide an explanation why life is common in the universe
听力原文:M: Let's look at a few things about English. What is a compound word?
W: Two chemicals mixed together?
M: Very funny, but no.
W: TWO words mixed together.
M: Well, yes, in a manner of speaking. A compound word is made up of two or more words that express a single idea. There are different ways that compound nouns can be formed. We are going to concentrate here on the noun plus noun form. Can you come up with any examples?
W: Doghouse, dog plus house. Cupcake, cup and cake.
M: Excellent. There are three different ways to form. this type of compound noun: there is the closed form, in which the words come together as one, such as firefly, keyboard, notebook.
W: Textbook, fireplace.
M: Great. And there is the hyphenated form. ski-boot, daughter-in-law, sin-pack...The last form. of compound nouns is the open form, such as post office, history book, mineral water. Just exactly how and why these three exist is not clear, but it seems likely that the process will begin with two words, become hyphenated after a time, and then eventually end up as just one word. Language is a living thing and always changing.
What are the two people talking about in this conversation?
A.Chemistry.
B.Literature.
C.Linguistics.
D.Physics.
In the envelope ___ .
A. there are several one-hundred dollar bills in it.
B. are several one-hundred dollar bills.
C. where there are several one-hundred dollar bills.
D. which holds several one-hundred dollar bills in it .
A、Several months.
B、Several hours.
C、Several days.
D、/
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