11) Beth’s friends want to take her to a movie or a play for her birthday. Beth chooses to attend the play. We know that: A: a. Beth has made an irrational decision. B: b. not seeing the movie is Beth’s opportunity cost of attending the play. C: c. Beth did not make a decision at the margin. D: d. seeing the play did not cost Beth anything since she did not have to pay for the ticket.

27. Beth financed Jumpstart by

26. A friend called Thomas Back advised Beth to

Dryden Limited helped Beth to set up Jumpstart by providing

Which aspect of setting up Jumpstart was most difficult for Beth?

中国大学MOOC: Beth has a beautiful ______. Listen! She is singing very well.

Beth made some phone calls last month. [音频]/module/audioplay.html?objectid=c9c81236fad4bef9713a0d7439ab1f7c

William Shakespeare’s Four Tragedies are________. A: Hamlet, Othello, King Lear, Midsummer Night’s Dream B: Hamlet, As you like it, King Lear, Mac Beth C: Hamlet, Othello, King Lear, Mac Beth D: Hamlet, Othello, King Lear, The Merchant of Venice

Beth( )California in 1981 and( )in Texas ever since. A: has left; worked B: left; has worked C: has left; has worked D: left; worked

由于（）能通过对细胞膜的作用，增强对各种逆境的抵抗力，因此有人将其称为“逆境缓和激素”。 A: AABA B: BETH C: CBR D: DJA