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【单选题】
She seldom buys clothing for herself, ______ ?A.
don't she
B.
doesn't she
C.
do she
D.
does she
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【多选题】有关 RNA 病毒叙述中正确的是
A.
正链 RNA 具有感染性
B.
所有 RNA 病毒均为单倍体
C.
RNA 病毒在宿主细胞质内复制
D.
正链 RNA 可直接作为 mRNA
E.
负链 RNA 病毒携带依赖 RNA 的 RNA 多聚酶
【简答题】The (power) ______ engine of the car makes it possible for the car to run 100 kilometers per hour.
【多选题】The main parts that make up a car engine are()
A.
the engine block
B.
the cylinder
C.
the piston
D.
the crankshaft
【多选题】有关RNA病毒叙述中正确的是
A.
正链RNA具有感染性
B.
所有RNA病毒均为单倍体
C.
RNA病毒在宿主细胞质内复制
D.
正链RNA可直接作为mRNA
E.
负链RNA病毒携带依赖RNA的RNA多聚酶
【单选题】The engine of a good car is expected to run ______.
A.
easily
B.
quickly
C.
quietly
D.
smoothly
【单选题】For a car engine to work long and well, the owner should ______.
A.
replace the engine oil as recommended
B.
reduce the use of the car in summer
C.
clean the engine parts regularly
D.
change the brakes frequently
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