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【单选题】
下列关于核酸的叙述,正确的是 ( )A.
DNA 和 RNA 中的五碳糖相同
B.
组成 DNA 和 RNA 的元素都是 C 、 H 、 O 、 N 、 P 等
C.
T 2 噬菌体的遗传信息贮存在 RNA 中
D.
洋葱根尖细胞中的 DNA 和 RNA 都主要分布在细胞核中
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皮皮学刷刷变学霸
举一反三
【简答题】Some parcels of Japanese make have been sold ______ the level of USD 460 per metric ton.
【简答题】A woman needs special evaluation if she has some symptoms, such as recurrent chest pain and unexplained able______.
【单选题】Lingling needs some vegetable. She ________ some in the market tomorrow.
A.
buys
B.
bought
C.
is going to buy
D.
buy
【单选题】Why is the woman calling the delivery company?
A.
She needs some information.
B.
She wants packing materials.
C.
She is checking her package.
【单选题】市场上出现的一种“智能手机卡”，通过此卡，可以听到被人手机谈话的内容，并且能够进行短信拦截和GPS卫星定位系统。这属于哪种安全威胁？
A.
通信内容容易被窃听 与
B.
通信内容容易被假冒攻击
C.
通信内容容易被篡改
D.
通信内容容易被重传攻击
【单选题】Information indicates that some parcels of similar quality from other sources are being sold _________ a level about 8% lower than yours.
A.
at
B.
of
C.
by
D.
with
【简答题】A．She needs to improve her study skills. B．She'll feel better if she get some rest. C．She should make a doctor's appointment. D．Her medication isn't working well.
【单选题】肝炎病人可用 0.1% 的过氧乙酸或 1% ~ 2% 的漂白粉澄清液浸泡( )分钟后,再用清水冲洗干净
A.
5 ～ 10
B.
10 ～ 30
C.
30 ～ 60
D.
60
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