Lisa: Hi, Mike! I haven't seen you for ages! Mike: I know! I ... here for two weeks. I ... to
New York. been there?
Lisa: No, I don't like big cities. There are usually
people and there's ... noise.
Mike: I love New York! If you ... around the
city, you... some great places to eat
and things to see. And I went to ...jazz
concerts, too.
Lisa:
What other cities have you ?
Mike:I to Beijing and Shanghai.
Lisa:
That sounds great. If you go again, let
me know?
Mike: Sure!
1
a for
2 a have been
3 a was
4 a Have you
5 a too much
6 a too much
7 a walked
8 a find
9 a a little
10 a visit
11 a 've been
12 a I will
b since
b haven't gone
b have been
b Did you
b too many
b too many
b walk
b are finding
b a few
b visiting
b've gone
C some
c haven't been
c have gone
c Were you
ca few
c a little
c have walked
c will find
c enough
c visited
c haven't been
c will you
b you will
2. Судя по этим углам, можно заключить, что AD = AB, а раз AB = AC = BC, то AD = AB = BC = AC.
3. Раз в треугольнике AD = AC, то и угол ADC = угол ACD.
4. В треугольнике ABC угол A = угол B = угол C = 180/3 = 60 градусов.
5. В треугольнике ACD, как и всегда, сумма углов = 180 градусов. Но раз там угол D = угол C, то возьмём один из них за х. Получается, что х+х+90(угол DAB)+60(угол BAC) = 180.
180-90-60=2х
30=2х
х=15 градусов = угол ACD = ADC.
6. Угол D, как было указано в пункте №1, равен 45 градусам. Этот угол состоит из угла ADC (15 градусов) и угла CDB (который нам и надо найти). Получается, что:
45=15+CDB
CDB = 30 градусов