It is known to all that exercises are good for health.英译汉
A、hypha
B、gossamer
C、mycelium
D、spore
A、with genes that are far apart, double crossovers and other multiple-crossover events often lead to lethal recombinants that reduce the number of recombinant progeny.
B、with genes that are far apart, double crossovers and other multiple-crossover events often lead to nonrecombinant or parental offspring and thus reduce the true map distance.
C、crossover interference will cause more double crossovers and other multiple-crossover events to occur than would be expected and thus result in a higher number of recombinant progeny than expected to occur with genes that are far apart.
D、double crossovers and other multiple-crossover events occur more often when genes are close to each other and can be readily detected, so these map distances are more accurate than those for genes that are far apart.
E、when genes are far apart, single-crossover recombinant classes are more difficult to detect than when genes are close together.
A、dramatic blank verse
B、song
C、sonnet
D、couplet
The good situation came at last ____ we had been expecting in the past two years. |
[ ] |
A. where B. that C. when D. in which |
Questions 1 to 5 are based on the following passage:
In the past, operations were difficult. Until the middle of the eighteen fifties, surgery.
In some countries, up to 90 percent of patients died from infection after operations. In 1865, however, Joseph Lister, a British surgeon, found an answer to the problem. He used an “antiseptic” during and after operations. This killed the dangerous bacteria and most of his patients lived. Since then, surgeons have used antiseptics in all operations. Surgery has developed in many important ways since the day of Joseph Lister. Today, when patients go to hospital for an operation, they can expect the best treatment, in clean and hygienic conditions.
Operations were difficult and dangerous until_______.
A.1850
B.the middle of 1850
C.the middle of the fifties of the eighteenth century
D.the middle of the fifties of the nineteenth century
In the passage, surgery means__________.A.The performing of an operation
B.cure
C.treatment
D.medicine
Which topic of the following best suits the passage?A.Operations were difficult in the past
B.The devotion of Joseph Lister to medical science
C.Surgery has become safer
D.Developments in surgery
Joseph Lister was________.A.a Frenchman
B.a German
C.an Englishman
D.an American
In the past, up to 90 percent of patients died after operations mainly because__________.A.bacteria entered the cuts in the patients’ bodies and infection took place
B.the conditions in hospitals were bad
C.the skill of surgeons was not so good
D.there were no good medicine at that time
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