Which of the following is true according to the first paragraph？
A. Bacteria are as big as a pinhead.
Bacteria can not be seen by an ordinary microscope.
C. Bacteria are hard to see because they often live together.
D. Bacteria are very small so they can only be measured in microns.
A．will useB．useC．would useD．used
A. will use
B. use
C. would use
D. used
A．whereasB．thoughC．whileD．for
A. whereas
B. though
C. while
D. for
______that even people in the next room could hear him clearly.
A. So loudly he spoke
B. So loudly did he speak
C. So loudly he speaks
D. So loudly he speak
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