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【单选题】
下列关于生物多样性的叙述，正确的是（ ）A.
生态系统多样性是物种多样性的保证
B.
各种中药材的药用功能体现了生物多样性的间接价值
C.
大量引进国外物种是增加当地生物多样性的重要措施
D.
混合树种的天然林比单一树种的人工林更容易被病虫害毁灭
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举一反三
【单选题】Looked at in this way, the present situation about birds flu doesn't seem so ______. [ ]
A.
disappoint
B.
disappointing
C.
disappointed
D.
disappointment
【单选题】A medicine may help with your illness, but it may make you , so you must be careful not to drive a car after taking such a medicine.
A.
healthy
B.
strange
C.
tired
D.
excited
【单选题】at in this way, the situation doesn't seem so desperate.
A.
Looking
B.
Looked
C.
Being looked
D.
To look
【单选题】It is important to exclude any ________ illness that may be responsible for the fatigue.
A.
underlining
B.
underlying
C.
fatal
D.
incurable
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