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【单选题】
When you ______ the office, you'd better ______ that the lights are turned off. [ ]A.
leave; make sure
B.
leave; to make sure
C.
will leave; make sure
D.
will leave; to make sure
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【单选题】Scientists have known for some time that certain plants, called hyperaccumu-lators, can concentrate minerals at levels a hundredfold or greater than normal. A survey of known hyperaccumulators identif...
A.
To provide examples of plant types that cannot tolerate high levels of harmful minerals
B.
To show why so many plants are hyperaccumulators
C.
To help explain why hyperaccumulators can be found in so many different places
D.
To emphasize that hyperaccumulators occur in a wide range of plant types
【简答题】磁极间的作用规律 。
【简答题】磁极间的相互作用规律是：同名磁极相互________。
【单选题】But they’ve got to take photos ________.
A.
in designated places
B.
at a certain spot
C.
on a corner
D.
on the ground
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