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听对话，回答问题。 1. How will Amy go to Beijing this winter holiday? A. By plane. B. By car. C. By train. 2.What is the time now? A. 6: 45. B. 7: 00. C. 7: 15. 3. Which sport does Mike like? A. Skiing. B. Swimming. C. Fishing. 4. What did Ben do yesterday? A. He had a picnic. B. He looked for things on the Internet. C. He went out. 5 How long has Lucy been back? A. Three days later. B. Three days ago. C. For three days. 6. How's Jim? A. He's OK. B. He's ill. C. He's returned home. 7. What colour shoes did the man want to buy at first? A. Brown. B. Blue. C. Black. 8. What does the woman mean? A. She likes smoking. B. She doesn't mind the man's smoking. C. She doesn't want him to smoke. 9. What does the woman have for breakfast now? A. rice and fruit B. rice and eggs C. coffee and bread D. bread and fruit 10. How much does one cup cost if she buys two? A. ten yuan B. nine yuan C. twelve yuan D. eighteen yuan
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【单选题】以下关于FNN和错误反向传播（BP）算法的说法错误的是
A.
BP 算法是从输入层开始，逐层计算 δ 信号调整自身权重，并且将 δ 信号传向后一层
B.
BP 算法的出现解决了多层神经网络权重调整困难的问题
C.
BP 算法的核心是对隐含层神经元误差 E 的估计
D.
BP 算法对多层网络训练时使用的 sigmoid 激活函数存在“梯度弥散”问题
【简答题】抗原提呈细胞共同表达的分子是____。
【单选题】The first step in a PCR cycle is to heat the sample to 95°C. What is the purpose of heating the sample?
A.
To separate the two strands of DNA
B.
To allow the primer to anneal to the template
C.
To produce the optimal temperature for Taq dna polymerase to work
D.
To produce the optimal temperature for most enzymatic reactions
【单选题】以下关于FNN和误差反向传播（BP）算法的说法错误的是
A.
BP 算法是从输入层开始，逐层计算δ信号调整自身权重，并且将δ信号传向后一层
B.
BP 算法的核心是对隐含层神经元误差 E 的估计
C.
BP 算法对多层网络训练时使用的 sigmoid 激活函数存在“梯度弥散”问题
D.
BP 算法的出现解决了多层神经网络权重调整困难的问题
【单选题】When DNA polymerase is in contact with guanine in the parental strand, what does it add to the growing daughter strand?
A.
Phosphate
B.
Cytosine
C.
Uracil
D.
Guanine
【单选题】If the DNA strand shown below is used as a template for RNA polymerase, what would be the sequence of the resultant mRNA following transcription? 5'-CATTCCATAGCATGT-3'
A.
5'-UGUACGAUACCUUAC-3'
B.
5'-CAUUCCAUAGCAUGU-3'
C.
5'-GUAAGGUAUCGUACA-3'
D.
5'-ACAUGCUAUGGAAUG-3'
【单选题】以下关于 FNN和错误反向传播(BP)算法的说法错误的是:
A.
BP算法的核心是对隐含层神经元误差E的估计
B.
BP算法的出现解决了多层神经网络权重调整困难的问题
C.
BP算法是从输入层开始，逐层计算δ信号调整自身权重，并且将δ信号传向后一层
D.
BP算法对多层网络训练时使用的sigmoid激活函数存在“梯度弥散”问题
【单选题】The first step in a PCR cycle is to heat the sample to 95°C. What is the purpose of heating the sample?
A.
To allow the primer to anneal to the template
B.
To separate the two strands of DNA
C.
To produce the optimal temperature for Taq dna polymerase to work
D.
To produce the optimal temperature for most enzymatic reactions
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