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【简答题】
血液循环途径： (1)体循环： → →各级动脉→全身 （物质交换）→各级静脉→上、下腔 → 心房。体循环过程中，动脉血（含氧高，血鲜红）变 （含氧低，色暗红）。 (2)肺循环： 心室→ →肺部 （气体交换）→ →左心房。肺循环过程中，静脉血变 。 （3）体循环是血液从心脏 侧出发回到右侧，肺循环是血液从心脏 出发回到 ，这样就形成了一个完整的血液循环
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举一反三
【单选题】Exercise 2 Directions: You will hear a talk which introduces job interview skills. Please choose the best answer to each question. Part 1 6. Which of the following is not a bad answer listed in the le...
A.
I have great communication skills .
B.
I have great proposal writing skills.
C.
I have great negotiating skills.
D.
I wish to get a high pay.
【单选题】In a state in the USA, you _______ make ugly faces at a dog, or you can be arrested for doing so.
A.
have to
B.
don't have to
C.
must
D.
mustn't
【简答题】Complete the sentences with have to, must, don't have to or mustn't. Strange Laws and Rules 1 In a state in the USA, you _______ make ugly faces at a dog, or you can be arrested for doing so. 2 In Swi...
【单选题】-- Don't make faces in class. -- _____________.
A.
Sorry, I won't do it again
B.
Certainly, I will
C.
That's OK
D.
Excuse me, I am wrong
【单选题】Question 6, (c)
A.
periodic, 0.1s
B.
periodic, 0.05s
C.
periodic, 0.2s
D.
non-periodic
【单选题】The teacher tells the students ____ in class. [ ]
A.
don't make faces
B.
not make faces
C.
not to make faces
D.
to not make faces
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