更多"Plants with roots appeared about __"的相关试题:
[单项选择]Plants with roots appeared about ______ million years ago.
A. 430
B. 300
C. 330
D. 100
[单项选择]Roots of plants tend to grow downward into soil, unless-----more readily available at the surface.
A. have water
B. water has
C. is water
D. water is
[单项选择]The engineer ______ my father works is about 50 years old.
A. to whom
B. on whom
C. with which
D. with whom
[单项选择]（ ）about wild plants that they decided to make a trip to Madagascar for further research.
A. So curious the couple was
B. So curious were the couple
C. How curious the couple were
D. The couple was such curious
[单项选择]About how many dogs and cats are destroyed each year
A. 6 million.
B. 15 million.
C. 30 million.
D. 1 million.
[单项选择]People cannot survive without plants.
[单项选择]
Liquorice Consists of the dried,unpeded roots and stolns,and contains not less than 4．0% of glycyrrhizinic acid．Which of the following is true（）
A. 除去外皮的根
B. 除去外皮的根茎
C. 潮湿的根茎
D. 不少于4．0%的甘草酸
E. 低于4．0%的甘草酸
[单项选择]Researchers discovered that plants infected with a virus give off a gas that ______ disease resistance in neighboring plants.
A. contracts
B. activates
C. maintains
D. prescribes
[单项选择]The roots of the plant transmit the moisture and _________ to the trunk and branch.
A. nutritive
B. nutrients
C. nutritious
D. nutrition
[单项选择]What do plants do when they are thirsty
A. They give out faint cries.
B. They make noises to drive away insects.
C. They extend their water pipes.
D. They become elastic like rubber bands.
[单项选择]What plants do many insects tend to attack
A. Quiet plants.
B. Well-watered plants.
C. Healthy plants.
D. Thirsty plants.
[单项选择]Which of the following night flowering plants open slowly every night just at sunset
[单项选择]Plants can absorb the carbon dioxide through their ______ during the sunlight hours and produce oxygen which human beings need to survive.
A. slots
B. hoses
C. pores
D. sponges
[单项选择]Research discovered that plants infected with a virus give off a gas that______ disease resistance in neighboring plants.
A. contracts
B. activates
C. maintains
D. prescribes
